One of the nicer-looking and better-performing Chrome OS systems, the 13-inch Acer Chromebook adds some zip by ditching Intel for an Nvidia processor, but also hits a few issues with popular Chrome apps.

The design of Toshiba's high-end Kirabook hasn't changed since last year, but it has aged gracefully. The components get an update and the battery life gets a big boost, making this an all-around excellent, but expensive, ultrabook.

Toshiba enters the growing Chromebook market with the first 13-inch model. It's a great size for switching between travel and home/office use and feels comfortable to type on, but other Chromebooks offer more features for the same price.

Early versions of the Dell XPS 13 had promise, but lacked must-have features. Over time, the system slowly added a high-res display, then a touch screen, making the new 2014 version an ultrabook that hits nearly all the marks.

The HP Spectre 13 is an excellent all-around ultrabook, with a great keyboard, display, and battery life. The unique Control Zone touch pad is interesting, but I wish it were a little more useful and intuitive.